If l1, m1, n1 and l2, m2, n2 are the dir...

If `l_1, m_1, n_1` and `l_2, m_2, n_2` are the direction cosines of two mutually perpendicular lines, show that the direction cosines of the line perpendicular to both of these are `m_1n_2-m_2n_2, n_1l_2-n_2l_1, l_1m_2-l_2m_1`

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A N EXCEL PUBLICATION-THREE DIMENSTIONAL GEOMETRY-QUESTION BANK

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